[MERGE] Two small fixes

[Jelmer Vernooij]

Looking for a +1 on two small fixes:

 2180 Jelmer Vernooij   2006-12-12
      Make add_path() return inventory entry for root just like it does for other entries.

 2179 Jelmer Vernooij   2006-12-12
      Fix exception arguments.

Cheers,

Jelmer
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